CN108008407A - 3 D image acquring system - Google Patents
3 D image acquring system Download PDFInfo
- Publication number
- CN108008407A CN108008407A CN201610952558.9A CN201610952558A CN108008407A CN 108008407 A CN108008407 A CN 108008407A CN 201610952558 A CN201610952558 A CN 201610952558A CN 108008407 A CN108008407 A CN 108008407A
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- China
- Prior art keywords
- module
- control unit
- drive circuit
- tof sensor
- led drive
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
Abstract
The present invention relates to image acquisition technology field, more particularly to a kind of 3 D image acquring system, including acquisition module, control module, data transmission module and power module, acquisition module includes light illuminating unit and imaging sensor, light illuminating unit includes LED light source and LED drive circuit, LED drive circuit connects LED light source, imaging sensor uses TOF sensor, LED drive circuit and TOF sensor, control module includes control unit, clock circuit and A/D converting units, clock circuit and A/D converting units connect control unit respectively, control unit connects LED drive circuit and TOF sensor respectively, TOF sensor connects A/D converting units, data transmission module connects control unit, power module provides working power for each module of system.3 d image data is acquired using TOF sensor and correlation module, and can real-time display and storage on host computer, have the characteristics that Image Acquisition precision is high, system power dissipation is small, cost is low.
Description
Technical field
The present invention relates to image acquisition technology field, more particularly to a kind of 3 D image acquring system.
Background technology
3 Dimension Image Technique divided from scanning theory can be divided into scanning 3 Dimension Image Technique and Non-scanning mode three-dimensional into
As technology.Wherein, the most typical representative of scan-type is full scan formula laser radar, its operation principle is to be measured in a measurement with line
On the basis of, by the 3-D scanning process that whole space object is completed to space full scan.This scan-type it is three-dimensional into
As the advantages of technology is that detection range is remote, precision is high, but it is expensive, volume is big, can not meet consumer electronics product institute
The portability requirements needed.Corresponding with scan-type is no-raster 3 Dimension Image Technique, and this technology is obtaining object dimensional information
During and be not required to scan this interminable mechanically actuated, most typical application is binocular vision and structured light projection imaging skill
Art.Wherein, binocular vision technology imitates mankind's binocular vision image-forming principle, using several between light source and camera and object
What relation calculates distance, its is simple in structure, but precision is easier to be restricted in itself by system, and to external environmental factor
Compare it is sensitive, such as light conditions, whether block with target shape texture, another structure light imaging technology, although with
Binocular vision is compared, and to external environment condition without so sensitivity, but spatially any one point can be distinguished by being projected toward space
Structure light, such as grating fringe, thus this technology often optical projection system is required it is very harsh, along with various face structures
Light method, which is all difficult to, takes into account resolution ratio and measuring speed, and final distance calculating method could be improved.Therefore, it is three-dimensional at present
Imaging technique imaging definition, image taking speed, apart from computational accuracy and real-time in terms of these also there are many deficiencies,
And since price is high and volume is big, largely constrain the development of 3 Dimension Image Technique.
The content of the invention
It is an object of the invention to provide a kind of 3 D image acquring system, can accurately gather 3 d image data, real
The data and 3-D view that real-time display is got in present PC machine.
In order to solve the above technical problems, present invention employs a kind of 3 D image acquring system, including acquisition module, control
Module, data transmission module and power module, the acquisition module include light illuminating unit and imaging sensor, the light illuminating unit
Including LED light source and LED drive circuit, LED drive circuit connection LED light source, imaging sensor uses TOF sensor, described
LED drive circuit and TOF sensor, the control module includes control unit, clock circuit and A/D converting units, when described
Clock circuit and A/D converting units connect control unit respectively, and described control unit connects LED drive circuit and TOF sensings respectively
Device, the TOF sensor connect A/D converting units, and the data transmission module connects control unit, and the power module is to be
Each module of uniting provides working power.
In above-mentioned technical proposal, further, described control unit uses CPLD control chips.
In above-mentioned technical proposal, further, the data transmission module uses usb circuit, described control unit
Host computer is connected by usb circuit, by the data transfer of collection to host computer.
The present invention is acquired 3 d image data using TOF sensor and correlation module, and can be real on host computer
When show and storage, have the characteristics that Image Acquisition precision height, system power dissipation is small, cost is low.
Brief description of the drawings
Fig. 1 is structure diagram of the present invention.
Fig. 2 is the circuit diagram of LED drive circuit of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with the accompanying drawings.
Such as Fig. 1, for the system architecture diagram of the present embodiment 3 D image acquring system, which mainly includes collection mould
Block, control module, data transmission module and power module, acquisition module include light illuminating unit and imaging sensor, the illumination
Unit includes LED light source and LED drive circuit, LED drive circuit connection LED light source, and imaging sensor uses TOF sensor,
The LED drive circuit and TOF sensor, the control module include control unit, clock circuit and A/D converting units, institute
State clock circuit and A/D converting units connect control unit respectively, described control unit connects LED drive circuit and TOF respectively
Sensor, the TOF sensor connect A/D converting units, and the data transmission module connects control unit, the power module
Working power is provided for each module of system.
TOF sensor uses the PMD19k-S3 sensor chips of PMD companies in the present embodiment, can capture at the same time in real time
Distance and half-tone information, high accuracy, low-power consumption, readout clock can reach 15MPixel/s；Maximum frame per second 80fps；It is integrated
Background Xanthophyll cycle function；Three column datas can be exported at the same time；All reset timing, exposure time series and readout sequences are all by external electrical
Road provides.On piece modulation driving；And configured by serial peripheral interface bus；Can accurately be calculated with outdoor environment indoors away from
From information；Under the resolution ratio of 160*120, detecting distance 2m.The sensor chip 40 pins altogether, ranks control signal
Major part is accounted for, additionally there are 5 SPI interfaces, PMD19k-S3 there are two kinds of different serial SPI interfaces, every kind of there are one 8
Memory space come configure numeral and simulation system parameter.Two kinds of interface common pins, are that configuration numeral or simulation pass through two
Selection line CE_A and CE_D switches；Wherein configuration analog portion is mainly used for configuring sense amplifier, and configuration numerical portion is used
To configure systematic parameter.
LED light source uses the high-power near infrared light LED of model SFH4235, and SFH4235 is the heap in OSRAM products
Stack-type number, light source center wavelength can meet the use demand of system in 850nm.LED drive circuit is as shown in Fig. 2, by two
SN74LVC chips and Si1553DL chips composition, the requirement of SFH4235, the drive on each of which road are met by two-way output
Streaming current is 0.5A.
In the system control module as the core control portions of system, it is necessary to complete TOF sensor, A/D data conversions
And the control of the driver' s timing of control unit, therefore, the control unit selection CPLD chips of the module, specifically, the present embodiment
Middle CPLD chips are using the XC2C256CoolRunner-II of Xilinx companies as kernel control chip.
The data that TOF sensor collects in system are transmitted in host computer into line number in real time by data transmission module
According to processing and image display, data transmission module uses usb circuit in the present embodiment, is expired by usb circuit
The demand of pedal system high speed data transfer.Specifically, usb circuit uses CY7C68013A chips, be a high integration,
2.0 microcontrollers of USB of low-power consumption, can most reach more than 53 Mbytes per second soon with the traffic rate of host computer,
CY7C68013A compatibilities USB 2.0 and USB1.0 agreements；Support both of which：GPIF patterns and from fifo mode, Ke Yiyu
Other general-purpose interfaces carry out seamless connection, so can greatly shorten the development time, reduce development cost.Meanwhile
CY7C68013A support from external crystal-controlled oscillation input 24MHz clock signal, main control enable signal all with CPLD chip phases
Even, so that control unit controls the processes such as its working method, data transfer.
Since the signal exported from TOF sensor is analog voltage signal, it is therefore desirable to first carry out ability after analog-to-digital conversion
It is transmitted, stores operation, and PMD19k-s3 sensor chips are three-channel parallel output, and system A/D converting units use one
A ADC conversion chips that can be carried out at the same time three tunnel AD conversion, specifically, that employed in the present embodiment is Analog
The AD9826 chips of Device companies.AD9826 chips are the analogue signal processors of a 16, are employed for R/G/B
The triple channel sampling structure framework of the output of three primary colours ccd array；Each single channel is by clamp circuit, correlated-double-sampling CDS
And the circuit such as programmable gain amplifier PGA composition.CDS circuits are internally integrated, can be with for the sensor of existing CDS functions
Make CDS invalid by configuring ADC registers；Its maximum sampling rate is up to 15MSPS.AD9826 can be in 6 kinds of different patterns
Lower work：3 channel C DS patterns, 3 passage SHA patterns, 2 channel C DS patterns, 2 passage SHA patterns, 1 channel C DS patterns, 1 passage
SHA patterns.3 passage SHA patterns are utilized in system, realize the processing to three row output datas of TOF sensor.The work of AD9826
Make process by CPLD chips to control.
System power supply uses 5V power inputs, and the work electricity in system needed for each module is converted to by electrical level transferring chip
Press, carry out the level conversion of 5V to 3.3V in power module using AS1117, AS1117 supports fixed mode 5V inputs 3.3V
Level exports；The power supply that 5V to 1.9V is completed using TPS71719 is changed, and the power supply that 5V to 1.8V is completed using LD1117S18 is turned
Change.
The system produces the reference clock signal of 100MHz, the output of CPLD chips at work, by the crystal oscillator of clock circuit
Control signal resets TOF sensor, exposes and read operation, and in exposure process, CPLD chips send out frequency at the same time
Rate is the square-wave modulation signal of 20MHz, and to control the light intensity of LED light source, while CPLD chips produce one and believe with square-wave frequency modulation
Number in the same direction same frequency control signal be sent into the corresponding pin of TOF sensor；TOF sensor read data by AD9826 into
Row analog-to-digital conversion, obtains first group of data at this time；Expose and read again again, the difference of exposure is TOF sensor with first time
Modulated signal is compared to 90 ° of first time exposure delay, and the analog signal output after reading is to AD9826, and this results in second group
Data, are repeated twice by the above process, and the control signal produced by CPLD postpones 180 ° and 270 ° than modulated signal respectively, on
After the completion of stating process, you can required four frame image data of whole of a frame depth data is obtained on host computer.
The present invention specification and drawings be considered as it is illustrative and not restrictive, on the basis of the present invention, ability
Field technique personnel are according to disclosed technology contents, it is not necessary to which performing creative labour can make some of technical characteristics
Some are replaced and deformation, within the scope of the present invention.
Claims (3)
1. 3 D image acquring system, it is characterised in that：Including acquisition module, control module, data transmission module and power supply mould
Block, the acquisition module include light illuminating unit and imaging sensor, and the light illuminating unit includes LED light source and LED drive circuit,
LED drive circuit connects LED light source, and imaging sensor uses TOF sensor, the LED drive circuit and TOF sensor, institute
Stating control module includes control unit, clock circuit and A/D converting units, and clock circuit and the A/D converting unit connects respectively
Control unit is connect, described control unit connects LED drive circuit and TOF sensor respectively, and the TOF sensor connection A/D turns
Unit is changed, the data transmission module connects control unit, and the power module provides working power for each module of system.
2. 3 D image acquring system according to claim 1, it is characterised in that：Described control unit is controlled using CPLD
Chip.
3. 3 D image acquring system according to claim 1, it is characterised in that：The data transmission module uses USB
Interface circuit, described control unit connects host computer by usb circuit, by the data transfer of collection to host computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610952558.9A CN108008407A (en) | 2016-11-02 | 2016-11-02 | 3 D image acquring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610952558.9A CN108008407A (en) | 2016-11-02 | 2016-11-02 | 3 D image acquring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108008407A true CN108008407A (en) | 2018-05-08 |
Family
ID=62047389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610952558.9A Pending CN108008407A (en) | 2016-11-02 | 2016-11-02 | 3 D image acquring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108008407A (en) |
-
2016
- 2016-11-02 CN CN201610952558.9A patent/CN108008407A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180508 |
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| WD01 | Invention patent application deemed withdrawn after publication |